rs549894501

Positions:

• chr2-189179530-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6 BP7 BS1 BS2

The NM_000393.5(COL5A2):​c.75A>G​(p.Lys25Lys) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000315 in 1,611,962 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00028 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00032 (0 hom.)
• Consequence: COL5A2 NM_000393.5 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:10
• Conservation: PhyloP100: 2.68

Genes affected

COL5A2 (HGNC:2210): (collagen type V alpha 2 chain) This gene encodes an alpha chain for one of the low abundance fibrillar collagens. Fibrillar collagen molecules are trimers that can be composed of one or more types of alpha chains. Type V collagen is found in tissues containing type I collagen and appears to regulate the assembly of heterotypic fibers composed of both type I and type V collagen. This gene product is closely related to type XI collagen and it is possible that the collagen chains of types V and XI constitute a single collagen type with tissue-specific chain combinations. Mutations in this gene are associated with Ehlers-Danlos syndrome, types I and II. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.62).
• BP6: Variant 2-189179530-T-C is Benign according to our data. Variant chr2-189179530-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 213090.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=6, Uncertain_significance=2, Benign=2}. Variant chr2-189179530-T-C is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=2.68 with no splicing effect.
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.000319 (465/1459680) while in subpopulation MID AF= 0.00451 (26/5766). AF 95% confidence interval is 0.00316. There are 0 homozygotes in gnomad4_exome. There are 264 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 42 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL5A2	NM_000393.5	c.75A>G	p.Lys25Lys	synonymous_variant	1/54	ENST00000374866.9	NP_000384.2
COL5A2	XM_011510573.4	c.-42+45618A>G		intron_variant			XP_011508875.1
COL5A2	XM_047443251.1	c.-42+45618A>G		intron_variant			XP_047299207.1
COL5A2	XM_047443252.1	c.-42+45618A>G		intron_variant			XP_047299208.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL5A2	ENST00000374866.9	c.75A>G	p.Lys25Lys	synonymous_variant	1/54	1	NM_000393.5	ENSP00000364000.3
COL5A2	ENST00000618828.1	c.-556A>G		5_prime_UTR_variant	1/47	5		ENSP00000482184.1
COL5A2	ENST00000649966.1	c.-42+45618A>G		intron_variant				ENSP00000496785.1

Frequencies

GnomAD3 genomes AF: 0.000276 AC: 42 AN: 152164 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.000577

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00103

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000441

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000319 AC: 79 AN: 247730 Hom.: 0 AF XY: 0.000381 AC XY: 51 AN XY: 133774

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000117

Gnomad ASJ exome AF: 0.000814

Gnomad EAS exome AF: 0.0000545

Gnomad SAS exome AF: 0.000866

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000321

Gnomad OTH exome AF: 0.000659

GnomAD4 exome AF: 0.000319 AC: 465 AN: 1459680 Hom.: 0 Cov.: 31 AF XY: 0.000364 AC XY: 264 AN XY: 725860

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000202

Gnomad4 ASJ exome AF: 0.000617

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000793

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000284

Gnomad4 OTH exome AF: 0.000481

GnomAD4 genome AF: 0.000276 AC: 42 AN: 152282 Hom.: 0 Cov.: 31 AF XY: 0.000242 AC XY: 18 AN XY: 74466

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000261

Gnomad4 ASJ AF: 0.000577

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00104

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000441

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000376 Hom.: 0

Bravo AF: 0.000306

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:10

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:4

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Sep 01, 2016	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Feb 20, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jan 01, 2024	COL5A2: BP4, BS2 -
Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -

not specified Benign:2

Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 22, 2015	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Ehlers-Danlos syndrome, classic type, 2 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago	Aug 29, 2022	This variant has not been reported in the literature but is present in the Genome Aggregation Database (Highest reported MAF: 0.09% [26/30026]; https://gnomad.broadinstitute.org/variant/2-190044256-T-C?dataset=gnomad_r2_1), and in ClinVar, with classifications ranging from uncertain significance to benign (Variation ID:213090). Of note, this is a silent variant and does not change the amino acid and is not predicted to impact splicing, reducing the probability that this variant is disease-causing. In summary, data on this variant suggests that this variant does not cause disease but requires further evidence. Therefore, this variant is classified as likely benign. -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Ehlers-Danlos syndrome type 7A Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Familial thoracic aortic aneurysm and aortic dissection Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 09, 2017

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Ehlers-Danlos syndrome, classic type, 1 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.62
CADD	Benign	12
DANN	Benign	0.81

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs549894501; hg19: chr2-190044256;